@echo off 
setlocal enabledelayedexpansion 
set topic[0]=comments 
set topic[1]=variables 
set topic[2]=Arrays 
set topic[3]=Decision making 
set topic[4]=Time and date 
set topic[5]=Operators 
for /l %%n in (0,1,5) do ( 
   echo !topic[%%n]! 
)